A documentary on Kent's police commissioner has damaged the reputation of the force - even before it has been broadcast in full, according to the Kent Police Federation.

Channel 4 show Meet The Commissioner is due to be broadcast tomorrow, but several clips have already been posted as a trailer - including one in which Ann Barnes is seen struggling to say what her job involves.

Another features the commissioner trying to explain a system of policing priorities called "the onion".

Ian Pointon, who represents rank and file officers in the force as chairman of the Kent Police Federation, said: "I have only seen the preview clips and consequently will reserve judgement until I have seen the entire programme.

"However, I am concerned about the reputational damage caused by these clips, reputational damage to police officers, their staff colleagues and Kent Police.

"It is important we all understand that Mrs Barnes does not run the force - the chief constable runs Kent Police, a police officer with 30 years of policing experience."